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authorAndré Goddard Rosa <andre.goddard@gmail.com>2009-12-15 16:47:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:12 -0800
commit417e315247ebc199d357855bb08d2a5264400565 (patch)
tree84383762d1abaebaa00928bbfc23851742d9cf9b
parent7be6d991bca63bbcdc5bc3b09789f367a3486537 (diff)
pid: reduce code size by using a pointer to iterate over array
It decreases code size by 16 bytes on my gcc 4.4.1 on Core 2: text data bss dec hex filename 4314 2216 8 6538 198a kernel/pid.o-BEFORE 4298 2216 8 6522 197a kernel/pid.o-AFTER Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/pid.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/pid.c b/kernel/pid.c
index 55fd5900bac..2e17c9c92cb 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -269,12 +269,11 @@ struct pid *alloc_pid(struct pid_namespace *ns)
for (type = 0; type < PIDTYPE_MAX; ++type)
INIT_HLIST_HEAD(&pid->tasks[type]);
+ upid = pid->numbers + ns->level;
spin_lock_irq(&pidmap_lock);
- for (i = ns->level; i >= 0; i--) {
- upid = &pid->numbers[i];
+ for ( ; upid >= pid->numbers; --upid)
hlist_add_head_rcu(&upid->pid_chain,
&pid_hash[pid_hashfn(upid->nr, upid->ns)]);
- }
spin_unlock_irq(&pidmap_lock);
out: